If the range of a gun which fires a shell with muzzle speed $V$ is $R$,then the angle of elevation of the gun is
- A$\cos^{-1}\left(\frac{V^2}{Rg}\right)$
- B$\cos^{-1}\left(\frac{gR}{V^2}\right)$
- C$\frac{1}{2}\left(\frac{V^2}{Rg}\right)$
- D$\frac{1}{2}\sin^{-1}\left(\frac{gR}{V^2}\right)$
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